/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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package org.apache.spark.sql.execution.datasources.oap.io

import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.execution.datasources.PartitionedFile
import org.apache.spark.sql.execution.datasources.oap.INDEX_STAT._

abstract class OapDataReader {
  def read(file: PartitionedFile): Iterator[InternalRow]

  // The two following fields have to be defined by certain versions of OapDataReader for use in
  // [[OapMetricsManager]]
  def rowsReadByIndex: Option[Long]
  def indexStat: INDEX_STAT
}
